GMAT: Data sufficiency 6 | Data sufficiency | GMAT | Khan Academy

28-32, pg. 280. Created by Sal Khan.

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GMAT on Khan Academy: Sal works through the 249 problem solving questions in chapter 5 of the the 11th edition of the official GMAC GMAT Review (ISBN Number: 0-9765709-0-4 published in 2005)

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